Cut stems off flowers, leaving about 1/2". Using a container with a tight fitting lid, fill it with a few inches of silica sand. Nestle flower heads in the sand and lightly cover the heads with sand. Close lid of box and allow to dry according to package directions.
To use silica sand, you need to have a container in which to preserve your flowers. Pour a layer of silica sand on the bottom and place the flowers on top of the layer, face down. Gently cover these flowers with the remaining silica sand and allow to sit undisturbed for at least one month.
It's fun and not at all difficult. Get a bowl that will hold your flower, and pour a little of the sand in the bottom. Position your flower in the sand, then slowly and gently pour or spoon more sand around and on top of the blossom until buried. Leave for 2-4 weeks. Uncover dried flower and enjoy.